向家坝水电站大坝抗震安全性研究

Research on anti-seismic safety for Xiangjiaba Hydropower Station

向家坝混凝土重力坝具有坝高、库容大、坝基岩体破碎、地震设防烈度高等特点。为探讨大坝抗震稳定性,采用材料力学、线弹性有限元、非线性有限元方法,对非溢流坝段的应力、稳定及极限抗震能力进行了深入研究,获得了向家坝重力坝在地震作用下的动力特性和超载安全系数。针对坝段头部、坝踵部位、上游面变态混凝土内等薄弱部位提出了相应的工程处理措施,以增强混凝土重力坝的抗震性能。

Xiangjiaba Hydropower Station is characterized as high gravity dam , large storage capacity , crushed rock dam foun-dation and high seismic intensity .To analyze the anti -seismic stabilities, the stress, stability and the ultimate seismic resistance capacity of the non-overflow dam monolith are deeply studied to acquire dynamic characteristics and overload security coeffi -cients by using the mechanics of materials , linear elastic finite element , and nonlinear finite element .Afterwards, the corre-sponding construction measures are put forward to enhance the seismic resistance performance for the weak parts such as the dam head, dam heel, and the abnormal concrete in inner part of upstream face .